Adjustable support stand



FIG. 1 is a perspective view taken from the front of an adjustable support stand showing our new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view thereof being a mirror image except for the lobes of the knob which would appear in a slightly different orientation as can be readily ascertained from FIG. 1;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for an adjustable support stand, substantially as shown and described. 